DIN Determination of the water vapour transmission rate of plastic film, rubber sheeting, paper, board and other sheet materials by gravimetry. DIN Testing of plastics and elastomer films, paper, board and other sheet materials – Determination of water vapour transmission. DIN ENG_机械/仪表_工程科技_专业资料。Determination of the water vapour transmission rate of plastic film, rubber sheeting.
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Water or water vapour. Amendments This standard differs from the November edition as follows. Weigh the dish and sample and the lid if fitted to an accuracy of 0,1 mg, then place it in the evaporation chamber and remove the lid. Under refined test conditions e. The amount of water vapour that passes through the test area of the sample surface and is absorbed by the desiccant is determined by weighing the dish at regular intervals and recording the increase in mass.
Take the arithmetic mean of the individual values and report it to three significant places, but dij to more than one decimal place. Use atmosphere B rin rubber sheets, atmosphere D for plastic film and laminated paper, and atmospheres D and E for paper and board. It is advantageous to use material with a particle size of 1,5 mm to 2 mm that passes through a 4 mm sieve, has been freed of any fines using a 1,6 dn sieve, and has been dried in the normal manner.
If the wax is spread out on the rims with the aid of a hot spatula, check that the seal is still intact after the sealant has cooled. The permeation gas displaces liquid out of a U-tube which is connected with the other chamber. If the samples have been prepared using solvents, residues of the latter left in the sample may affect the test results.
For non flat specimens: If the two surfaces of the sample are not the same, the test area, i. Please inform us, if your samples tend to mechanical failure under applied pressure of the test gas or the sealings.
Water vapor permeability (electrolysis method) DIN / DIN A
Thus the predictions according resitance, physical and chemical reactions under process conditions can help in the selection process of materials.
Sealant, consisting of a wax mixture that adheres strongly to both the dish and the sample, is not brittle at the measuring temperature and is neither hygroscopic nor susceptible to oxidation. See DIN for other methods of determining water vapour transmission rates e.
Check that the increase in mass between two consecutive weighings is at least 5 mg. In keeping with current practice in standards published by the International Organization for Standardization ISOa comma has been used throughout as the decimal marker.
If you want to conduct the cutting of the specimens yourself, please contact us for the required dimensions. Furthermore interactions between media and polymer can be investigated.
Subtract the blank values from the values measured for the sample dishes having undergone the same treatment. The specimens shall be uniform in thickness, representative for the material and free of pinholes and folds.
Cover templates of the type shown in figure 4 facilitate the sealing operation. Based on this method Mecadi dih further examination to determine gas solubilities sorption and desorptiondiffusion coefficients and the measurement of break through times through barriers.
This equation applies if the interval between consecutive weighings is 24 hours see subclause 8. In the case of products having an outer layer, determine the mass per unit area as described in DIN Details of sealing samples 8 8. If these conditions are fulfilled, the water vapour transmission rate, WVTR, of similar samples of different thickness is inversely proportional to the thickness, cin.
We recommend the measurement of three independent samples per test minimum number not regulated by the standard. A desiccator as shown in figure 1, for example, in a controlled-temperature or air-conditioned room may be used as evaporation chamber. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated 553122 it by amendment or revision.
The permeation coefficient is calculated as the slope of the displaced volume against time.
On request, we measure your sample thickness according to DIN Two points are important in selecting the size of dish, namely preventing the desiccant from becoming saturated during the test, on the one hand, and minimizing the total mass, on the other, cin reduce its effect on the accuracy of weighing.
If the water vapour transmission rate is low, the thickness of the samples is large or the samples are very hygroscopic, one or two additional samples shall be prepared. We will test with other climate conditions on your request.